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Commons Math example source code file (

This example Commons Math source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Math tags/keywords

differentiableunivariaterealfunction, differentiableunivariaterealfunction, expm1function, expm1function, functionevaluationexception, functionevaluationexception, univariaterealfunction, univariaterealfunction

The Commons Math source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.math.analysis;

import org.apache.commons.math.FunctionEvaluationException;

 * Auxillary class for testing purposes.
 * @version $Revision: 786927 $ $Date: 2009-06-20 19:37:47 -0400 (Sat, 20 Jun 2009) $
public class Expm1Function implements DifferentiableUnivariateRealFunction {

    public double value(double x) throws FunctionEvaluationException {
        // Math.expm1() is available in jdk 1.5 but not in jdk 1.4.2.
        return Math.exp(x) - 1.0;

    public UnivariateRealFunction derivative() {
        return new UnivariateRealFunction() {
            public double value(double x) throws FunctionEvaluationException {
                return Math.exp(x);

Other Commons Math examples (source code examples)

Here is a short list of links related to this Commons Math source code file:

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